A blockerror occurs when one or more bits in a block are wrong. To be able to detect block errors, additional information must be transmitted, namely the parity bit or the checksum(CRC). Indata transmission, the block error rate (BLER) indicates the ratio of data blocks received with errors to the total number of data blocks transmitted. If every data block transmitted is erroneous, then the ratio of erroneous data blocks to the total number of data blocks is equal, in which case the error rate is 1. If one data block out of `10^5` data blocks is erroneous, then the block error rate is `10^-5`. Inmultimedia technology, the block error rate is a measure of the data integrity on a compact disc(CD) or DVD. It expresses how many errors occurred within one second. These specifications are given in the Red Book and Yellow Book, whereby an average error frequency of less than 200 per second is still accepted.